os: Plan 9 support.
R=rsc, ality, r, r2
CC=golang-dev
https://golang.org/cl/4149046
diff --git a/src/pkg/os/stat_plan9.go b/src/pkg/os/stat_plan9.go
new file mode 100644
index 0000000..e96749d
--- /dev/null
+++ b/src/pkg/os/stat_plan9.go
@@ -0,0 +1,84 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package os
+
+import "syscall"
+
+func fileInfoFromStat(fi *FileInfo, d *Dir) *FileInfo {
+ fi.Dev = uint64(d.Qid.Vers) | uint64(d.Qid.Type<<32)
+ fi.Ino = d.Qid.Path
+
+ fi.Mode = uint32(d.Mode) & 0777
+ if (d.Mode & syscall.DMDIR) == syscall.DMDIR {
+ fi.Mode |= syscall.S_IFDIR
+ } else {
+ fi.Mode |= syscall.S_IFREG
+ }
+
+ fi.Size = int64(d.Length)
+ fi.Atime_ns = 1e9 * int64(d.Atime)
+ fi.Mtime_ns = 1e9 * int64(d.Mtime)
+ fi.Name = d.Name
+ fi.FollowedSymlink = false
+ return fi
+}
+
+// arg is an open *File or a path string.
+func dirstat(arg interface{}) (fi *FileInfo, err Error) {
+ var name string
+ nd := syscall.STATFIXLEN + 16*4
+
+ for i := 0; i < 2; i++ { /* should work by the second try */
+ buf := make([]byte, nd)
+
+ var n int
+ var e syscall.Error
+
+ switch syscallArg := arg.(type) {
+ case *File:
+ name = syscallArg.name
+ n, e = syscall.Fstat(syscallArg.fd, buf)
+ case string:
+ name = syscallArg
+ n, e = syscall.Stat(name, buf)
+ }
+
+ if e != nil {
+ return nil, &PathError{"stat", name, e}
+ }
+
+ if n < syscall.STATFIXLEN {
+ return nil, &PathError{"stat", name, Eshortstat}
+ }
+
+ ntmp, _ := gbit16(buf)
+ nd = int(ntmp)
+
+ if nd <= n {
+ d, e := UnmarshalDir(buf[:n])
+
+ if e != nil {
+ return nil, &PathError{"stat", name, e}
+ }
+
+ return fileInfoFromStat(new(FileInfo), d), nil
+ }
+ }
+
+ return nil, &PathError{"stat", name, Ebadstat}
+}
+
+
+// Stat returns a FileInfo structure describing the named file and an error, if any.
+func Stat(name string) (fi *FileInfo, err Error) {
+ return dirstat(name)
+}
+
+// Lstat returns the FileInfo structure describing the named file and an
+// error, if any. If the file is a symbolic link (though Plan 9 does not have symbolic links),
+// the returned FileInfo describes the symbolic link. Lstat makes no attempt to follow the link.
+func Lstat(name string) (fi *FileInfo, err Error) {
+ return dirstat(name)
+}
